I must announce you must announce he must announce we must announce you must announce they must announce
V-ing form
I must be announcing you must be announcing he must be announcing we must be announcing you must be announcing they must be announcing
Perfect
I must have announced you must have announced he must have announced we must have announced you must have announced they must have announced
V-ing perfect
I must have been announcing you must have been announcing he must have been announcing we must have been announcing you must have been announcing they must have been announcing
Negation
Simple form
I mustn't announce you mustn't announce he mustn't announce we mustn't announce you mustn't announce they mustn't announce
V-ing form
I mustn't be announcing you mustn't be announcing he mustn't be announcing we mustn't be announcing you mustn't be announcing they mustn't be announcing
Perfect
I mustn't have announced you mustn't have announced he mustn't have announced we mustn't have announced you mustn't have announced they mustn't have announced
V-ing perfect
I mustn't have been announcing you mustn't have been announcing he mustn't have been announcing we mustn't have been announcing you mustn't have been announcing they mustn't have been announcing
Interrogative form
Simple form
must I announce? must you announce? must he announce? must we announce? must you announce? must they announce?
V-ing form
must I be announcing? must you be announcing? must he be announcing? must we be announcing? must you be announcing? must they be announcing?
Perfect
must I have announced? must you have announced? must he have announced? must we have announced? must you have announced? must they have announced?
V-ing perfect
must I have been announcing? must you have been announcing? must he have been announcing? must we have been announcing? must you have been announcing? must they have been announcing?
Interro-negative form
Simple form
mustn't I announce? mustn't you announce? mustn't he announce? mustn't we announce? mustn't you announce? mustn't they announce?
V-ing form
mustn't I be announcing? mustn't you be announcing? mustn't he be announcing? mustn't we be announcing? mustn't you be announcing? mustn't they be announcing?
Perfect
mustn't I have announced? mustn't you have announced? mustn't he have announced? mustn't we have announced? mustn't you have announced? mustn't they have announced?
V-ing perfect
mustn't I have been announcing? mustn't you have been announcing? mustn't he have been announcing? mustn't we have been announcing? mustn't you have been announcing? mustn't they have been announcing?